Add definition of defaults for Field Lookup

[abbadon1334]

add definition of plus button, in place of set "plus" => true and add the default label, "plus" => ['icon'=>'plus','class'=>'green']

[codecov]

Codecov Report

Merging #670 into develop will decrease coverage by 0.06%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #670      +/-   ##
=============================================
- Coverage      72.75%   72.69%   -0.07%     
- Complexity      1868     1869       +1     
=============================================
  Files            102      102              
  Lines           4416     4416              
=============================================
- Hits            3213     3210       -3     
- Misses          1203     1206       +3

Impacted Files	Coverage Δ	Complexity Δ
src/FormField/Lookup.php	76.53% <100%> (ø)	56 <0> (+1)	⬆️
src/TableColumn/Status.php	73.52% <0%> (-8.83%)	12% <0%> (ø)

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[codecov]

Codecov Report

Merging #670 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@              Coverage Diff              @@
##             develop     #670      +/-   ##
=============================================
+ Coverage      72.75%   72.76%   +<.01%     
- Complexity      1868     1870       +2     
=============================================
  Files            102      102              
  Lines           4416     4421       +5     
=============================================
+ Hits            3213     3217       +4     
- Misses          1203     1204       +1

Impacted Files	Coverage Δ	Complexity Δ
src/FormField/Lookup.php	76.79% <100%> (+0.25%)	56 <0> (+1)	⬆️
src/TableColumn/Actions.php	90.9% <0%> (-2.64%)	12% <0%> (+1%)
src/FormField/AutoComplete.php	65.95% <0%> (+0.36%)	33% <0%> (ø)	⬇️

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[DarkSide666]

Please fix comment in line 44 and not sure why you need to + arrays and not just use single array?
Also it would be good to mention this new possibility in docs and/or demos.

Besides that all looks good.

[DarkSide666]

Thanks !